Researchers Use Gold Nanoparticles to Unfold 3-D Structures

Researchers at NC State have developed a technique that uses nanoparticles, nanospheres and nanorods, to trigger shape changes in polymers. These differently shaped nanoparticles exhibit different surface plasmon resonances and will heat when exposed to specific wavelengths of light. When embedded in polymers, this causes the material to heat and change its shape. This work has the potential for use in soft robotics applications like biomedical implants. For more on this work, please see the NC State press release.

Sequential Actuation of Shape-Memory Polymers through Wavelength-Selective Photothermal Heating of Gold Nanospheres and Nanorods

Authors: Sumeet R. Mishra and Joseph B. Tracy, North Carolina State University

Published: June 15, Applied Nano Materials

DOI: 10.1021/acsanm.8b00394

Abstract: Photothermal triggering of shape-memory polymers is an appealing noncontact mode of actuation for responsive materials and soft robotics. Wavelength-selective photothermal triggering of shape recovery is reported in thermoplastic polyurethane shape-memory polymers with embedded gold (Au) nanospheres and nanorods. Light-emitting diodes with wavelengths of 530 and 860 nm matched to the surface plasmon resonances drive selective shape recovery. Wavelength-selective shape recovery enables sequential actuation, as demonstrated in a wavelength-controlled stage with optically controlled height and tilt angle using legs of shape-memory-polymer films with embedded Au nanospheres and nanorods.

 

NCSU Nanofabrication Facility Grand Re-opening

Over the past several months, the NCSU Nanofabrication Facility (NNF) has been the recipient of a significant amount of internal investment including new equipment, a staff increase, and major building renovations.  In order to bring awareness to this investment — and usher in a “new era” — NNF will hold a Grand Re-opening.
NNF Director of Operations Phil Barletta will introduce some of the changes and improvements that are being initiated in NNF:
  • New staff (and re-introduce “old” staff), including undergrad hire(s)
  • New equipment
  • New safety rules (after-hours access)
  • New bi-annual meeting schedule (along with yearly user clean-up)
  • New particle count/cleanliness monitoring protocol
  • New website
  • New social media presence
Assistant Vice Chancellor Jon Horowitz (ORIED) and Dean John Gilligan (COE) will say a few words from a University and College perspective.  There will also be 3-4 technical talks, focusing on work that has been performed in the NNF.  Both industry and academic users will present. Refreshments will be served throughout the event.
The event is free but please RSVP to Phil Barletta (pbarlet@ncsu.edu) by Friday, January 5.

NCSU Nanofabrication Facility Grand Re-Opening

Over the past several months, the NCSU Nanofabrication Facility (NNF) has been the recipient of a significant amount of internal investment including new equipment, a staff increase, and major building renovations.  In order to bring awareness to this investment — and usher in a “new era” — NNF will hold a grand re-opening on January 8, 2018 at 3 pmNNF Director of Operations Phil Barletta introduce some of the changes and improvements that are being initiated in NNF. He will be joined by Assistant Vice Chancellor Jon Horowitz (ORIED) and Dean John Gilligan (COE) who will say a few words from a University and College perspective.

Details and information on registering can be found on the event website.

Special Topics in TEM: EFTEM Workshop

NC State’s Analytical Instrumentation Facility (AIF) is giving a series of courses/workshops on various techniques in electron microscopy, which will focus on fundamental principles, data acquisition, and data processing/analysis. The second workshop in the Spring of 2017 will be focused on Energy-filtered TEM (EFTEM). The following topics will be covered in this workshop:

  1. Fundamentals of EFTEM
  2. Practical setup of EFTEM acquisition
  3. EFTEM Mapping methods (Jump ratio, 3-window, and Spectrum Imaging)
  4. EFTEM data processing/analysis, and multiple linear least squares (MLLS) fitting for mapping overlapped edges

To ensure each participant receives a maximum of time, the workshop will be limited to 6 participants. For more details and to register, please contact Dr. Yang Liu at his email yliu78@ncsu.edu. Registration costs: $50 for academic, government, and non-profit participants; $350 for industry participants.

Focused Ion Beam Short Course

NC State’s Analytical Instrumentation Facility will offer another Focused Ion Beam (FIB) short course on March 10th. The short course includes lectures covering an introduction to the FIB technique, an overview of the principles and operation of the FIB as well as applications such as FIB prepared SEM and TEM cross section. Also, there will be hands on demos of these applications on the AIF Quanta Dual Beam FIB-SEM. To ensure each student receives a maximum of time on the FIB, the course will be limited to 4 participants.

For more details and to register, please contact Fred Stevie at fred_stevie@ncsu.edu. Registration costs: $50 for academic, government, and non-profit participants; $350 for industry participants.